GRAMINEAE (GRASS FAMILY) 135 



»hort branches erect ; spikelets 4-5 ram. long ; glumes acute, slightly exceeding 

 the floret; lemma obscurely dentate, axon twisted below; palea about as long 

 as the lemma, callus-hairs scanty, \-\ as long. — Dry woods, N. Y. and Pa. 

 Aug. 



3. C. perplexa Scribn. Similar to the preceding, slightly glaucous ; panicle 

 oblong-lanceolate, contracted, 1-1.5. dm. long, the slender fascicled branches 

 erect or ascending, densely flowered ; spikelets 3.5-4 mm. long; glumes acumi- 

 nate ; awn slightly twisted below ; palea and copious callus-hairs | the length 

 of the lemma. {C. nemoralis Kearney, not Philippi.) — Rocky woods. Me. and 

 w. N. Y., local. 



* * Awn straight or nearly so, included ; callus-hairs usually not much shorter 



than the lemma. 



^ Panicle loose and open, even after flowering ; the mostly purple-tinged or 

 lead-colored strigose-scabroxis glumes not closing in fruit ■ copious callus- 

 hairs about equaling the lemma, not surpassed by those of the rudiment; 

 awn delicate. 



4. C. canadensis (Michx.) Beauv. (Blue-joint Grass.) Culms 6-15 dm. 

 high, clustered ; leaves 1.5-4 dm. long, flat, involute in drying, glaucous ; panicle 

 1-3 dm. long, the slender fascicled branches ascending or 



spreading; spikelets 3-3.5 mm. long; glumes equal, acute, 

 scarcely exceeding the thin erose-truncate lemma ; awn incon- 

 spicuous ; callus-hairs copious, about as long as the floret. — 

 Wet places, e. Que. to N. J., and westw. June, July. Fig. 



108. Var. acuminata Vasey. GUtmes 4-5 mm. long, attenu- 

 ate, exceeding the acute lemma ; awn less delicate and longer. — los. c. canadensis. 

 Lab., Nfd. ; White Mts., N. H. ; Roan Mt., N. C. ; and in Spikeletxs. 

 Rocky Mts. 



5. C. Langsd6rfii (Link) Trin. Similar to the preceding ; panicles usually 

 smaller; spikelets 5-6 mm. long; glumes acuminate, somewhat exceeding the 

 dentate lemma ; aw)i as long as the floret, less delicate than in G. canadensis. — 

 Moist meadows. Lab., mts. of N. E., L. Superior, and northwestw. Aug. 

 (Greenl., Eurasia.) 



-t- -t- Panicle contracted, strict, its short branches appressed or erect after 

 flowering; the scabrous glumes mostly closed; lemma less delicate, some- 

 times as firm in texture as the glumes ; awn stouter. 



6. C. neglecta (Ehrh.) Gaertner, Meyer & Scherbius. Bootstock slender; 

 culms slender, 4-6.5 dm. high ; leaves soft, 1-3 cm. long, smooth; panicle nar- 

 row, glomerate and lobed, 5-10 cm. long; spikelets about 4 mm. long ; glumes 

 acute ; callus-hairs a little shorter than the floret, and as long as those of the 

 rudiment; awn from the middle of the thin lemma or lower, barely exceed- 

 ing it. (C. stricta Man. ed. 6, not Trin.) — Wet shores and mountains, n. 

 N. E., L. Superior, northw. and westw. (Eurasia.) 



7. C. hyperbbrea Lange. Culms and rootstocks stouter than in the preceding ; 

 culms tufted, 4-10 dm. high ; leaves involute, rigid, roughish ; panicles 7-15 cm. 



long, dense ; spikelets 4-4.5 mm. long ; glumes acute, exceeding 

 the flcn-et ; callus-hairs §-| as long as the lemma. (O. lappo- 

 nica Man. ed. 6, not Kartm.) — Moist meadows and calcareous 

 cliffs, Greenl. to Alaska, s. to e. Que., n. Vt., "Pa.," Minn. ; 

 and in the Rocky Mts. 



8. C. inexpdnsa Gray. Culms solitary or few, slender, 



109. c. inexpansa. '^'^^ ^"i- ^^'S^ ; leaves 1.5-3 dm. long, 3-5 mm. wide, scabrous 

 Spikelet with de- ^-t^ove, flat, often involute in drying ; panicles pale, 1-2 dm. 

 tached glumes x 2. long, less densely flowered than others of this group ; spikelets 



4 mm. long ; glumes rather rigid, sharp-pointed, about \ longer 

 than the toothed lemma ; awn scarcely exceeding the lemma ; callus-liairs 

 \-\ shorter than the lemma. (C. confinis Man. ed. 6, not Nutt. ) — Swamps and 

 low prairies, N. Y. and N. J.; Minn, to Mo. and westw. July. Fig. 109. 



